Go to the Tree Of Mettle, then select "Enter Password", and enter one of the following passwords to unlock the corresponding bonus:

Result

Password

Figures

Gods And Angels

Fire, Sheep, Ox, Tiger

Inheritor Of The Will

Water, Dog, Snake, Ox

One Who Lurks in Darkness

Lightning, Dog, Tiger, Boar

Rivals

Earth, Sheep, Boar, Dog

Team Asuma

Fire, Dog, Rabbit, Tiger

Team Guy

Water, Dog, Rat, Rooster

Team Kurenai

Lightning, Snake, Dragon, Monkey

The Hokage's Office

Wind, Rabbit, Dragon, Ox

The Innocent Maiden

Water, Snake, Dragon, Ox

The Three Sand Siblings

Earth, Rooster, Ox, Snake

Ninjutsu

100m Punch

Lightning, Rat, Snake, Horse

Assault Blade

Wind, Rat, Rabbit, Ox

Bring Down the House Jutsu

Lightning, Sheep, Ox, Rooster

Cherry Blossom Clash

Fire, Monkey, Boar, Rabbit

Dead Soul Jutsu

Lightning, Monkey, Dog, Ox

Detonation Dispersion

Wind, Dragon, Horse, Rat

Dynamic Entry

Fire, Rooster, Rabbit, Boar

Feather Illusion Jutsu

Water, Dragon, Boar, Dog

Fire Style: Burning Ash

Fire, Rat, Rabbit, Monkey

Fire Style: Dragon Flame Bomb

Fire, Snake, Dragon, Rabbit

Fire Style: Fire Ball Jutsu

Fire, Dragon, Rat, Monkey

Fire Style: Yoruho'o

Fire, Horse, Rabbit, Sheep

Genjutsu: Haze

Wind, Dragon, Sheep, Rooster

Genjutsu: Madder Mist

Lightning, Rooster, Boar, Dog

Heaven Defending Kick

Earth, Rat, Boar, Monkey

Intensive Healing

Water, Rat, Tiger, Rat

Leaf Repeating Wind

Wind, Rooster, Ox, Tiger

Lightning Blade

Lightning, Monkey, Rooster, Snake

Lightning Style: Lightning Bolt Flash

Lightning, Sheep, Ox, Dog

Slithering Snakes

Lightning, Tiger, Rooster, Dog

Summoning: Rashomon

Earth, Monkey, Boar, Rooster

Tunneling Fang

Wind, Dog, Boar, Horse

Water Style: Ripping Torrent

Water, Ox, Dog, Sheep

Water Style: Water Fang Bomb

Water, Horse, Rat, Ox

Wind Style: Air Bullets

Wind, Ox, Boar, Rabbit

Weapon: Flash Kunai Ball

Fire, Sheep, Boar, Ox

Other

Hokage Naruto Wallpaper

Fire, Ox, Rabbit, Horse

Play as Nine-Tailed Demon Fox

Successfully complete Story mode. At the character selection screen, press Triangle to cycle through the portraits until Nine-Tailed Demon Fox appears. Press Triangle again to select him, then press Circle.

Bonus characters

Successfully complete the indicated task to unlock the corresponding character:

During certain missions, you are allowed to select any desired character to complete them. The following characters are recommended for certain missions because of special abilities and/or characteristics:

When you must reach the end of a stage within an certain time limit, use Asuma. He is very fast while running, and also jumps very high. Additionally, he has a slight glitch which allows him to teleport across the map. To have Asuma teleport, press the direction you want to travel on the D-pad and tap Square. Do not hold it down to complete his attack; just tap it. He will quickly glide a few feet, and when practiced enough, you can quickly move through the stage.

When you must break objects on the map, use Kisame if it is a straight or flat stage. His Samehada attack can quickly break through an entire line of crates in one hit. However, he is slow and his jump is not too good. If you are on a map where you need to jump around a lot, use Asuma instead because he is very agile and his attacks are quick.

When you must get a certain hit combo, use Kisame for 20-hit combos. He does approximately 20 hits with a single Samehada attack, and he is also a great fighter to use in battle. For 30-hit combos, use either Hidan or Hiraku. Hidan is a bit harder because you must chain his regular attacks with Giant Sickle Frenzy to do 30 hits or more. However, if you master that technique it will be much easier because he is a great fighter as well, and you can easily win with him. Hiraku is slow and not very strong, but if you use his Needle Barrage attack, you can get 50 hits or more at once, with no skill involved. After that, however, it is very difficult to win because he is not a great fighter. It is much easier if you have a friend help you with these missions; have one player using Hiraku to get the hit combo, and both players helping to win the battle.